Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754138AbXL3BlX (ORCPT ); Sat, 29 Dec 2007 20:41:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752102AbXL3BlO (ORCPT ); Sat, 29 Dec 2007 20:41:14 -0500 Received: from smtpq1.tilbu1.nb.home.nl ([213.51.146.200]:35238 "EHLO smtpq1.tilbu1.nb.home.nl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750965AbXL3BlM (ORCPT ); Sat, 29 Dec 2007 20:41:12 -0500 Message-ID: <4776F6A0.9010801@keyaccess.nl> Date: Sun, 30 Dec 2007 02:38:40 +0100 From: Rene Herman User-Agent: Thunderbird 2.0.0.9 (X11/20071031) MIME-Version: 1.0 To: pharon@gmail.com CC: "David P. Reed" , Richard Harman , Eduard-Gabriel Munteanu , LKML , Ingo Molnar Subject: Re: [PATCH] Option to disable AMD C1E (allows dynticks to work) References: <47765D11.2040903@reed.com> <1198967334.5049.3.camel@iamer-laptop> In-Reply-To: <1198967334.5049.3.camel@iamer-laptop> Content-Type: multipart/mixed; boundary="------------090605060307080505000205" X-Spam-Score: -1.0 (-) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 13036 Lines: 386 This is a multi-part message in MIME format. --------------090605060307080505000205 Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit On 29-12-07 23:28, Islam Amer wrote: > Thanks for the detailed response. > > I thought I had gotten to the bottom of my problems when I found that > udev workaround, I guess I was naive. > > I did the two tests you described and they predictably caused the hard > hangs. I needed to run the port80 program only once to get the hard > hang. > > The output of the dmidecode commands were : > > Quanta > 30B7 > > I applied the patch you provided ( luckily I am using 2.6.24-rc6-git3 > kernel because I need the b43 driver ), added these values and compiled. > > > { > .callback = dmi_io_delay_port_alt, > .ident = "Compaq Presario v6000", > .matches = { > DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"), > DMI_MATCH(DMI_BOARD_NAME, "30B7") > } > }, > > I was able to boot without the udev workaround and can now use hwclock > without hanging the system. In dmesg I can see this new line : Thanks much for testing (and David -- thanks for asking). Updated patch attached with this information. Compaq itself seems to spell the type with a capital V so that's the only difference... Can I add a "Tested-by: Islam Amer " to this? (and David, same for you with this address you're using in this thread?) Rene. --------------090605060307080505000205 Content-Type: text/plain; name="dmi-port80-minimal-bootparam.diff" Content-Transfer-Encoding: 7bit Content-Disposition: inline; filename="dmi-port80-minimal-bootparam.diff" commit 5f27525d3e796ae12e3186afe8ef0ec41af9e160 Author: Rene Herman Date: Mon Dec 17 21:23:55 2007 +0100 x86: provide a DMI based port 0x80 I/O delay override. Certain (HP/Compaq) laptops experience trouble from our port 0x80 I/O delay writes. This patch provides for a DMI based switch to the "alternate diagnostic port" 0xed (as used by some BIOSes as well) for these. David P. Reed confirmed that using port 0xed works and provides a proper delay on his HP Pavilion dv9000z, Islam Amer comfirmed that it does so on a Compaq Presario V6000. Both are Quanta boards, type 30B9 and 30B7 respectively and are the (only) machines for which the DMI based switch triggers. HP Pavilion dv6000z is expected to also need this but its DMI info hasn't been verified yet. The symptoms of _not_ working are a hanging machine, with "hwclock" use being a direct trigger and therefore the bootup often hanging already on these machines. Earlier versions of this attempted to simply use udelay(2), with the 2 being a value tested to be a nicely conservative upper-bound with help from many on the linux-kernel mailinglist, but that approach has two problems. First, pre-loops_per_jiffy calibration (which is post PIT init while some implementations of the PIT are actually one of the historically problematic devices that need the delay) udelay() isn't particularly well-defined. We could initialise loops_per_jiffy conservatively (and based on CPU family so as to not unduly delay old machines) which would sort of work, but still leaves: Second, delaying isn't the only effect that a write to port 0x80 has. It's also a PCI posting barrier which some devices may be explicitly or implicitly relying on. Alan Cox did a survey and found evidence that additionally various drivers are racy on SMP without the bus locking outb. Switching to an inb() makes the timing too unpredictable and as such, this DMI based switch should be the safest approach for now. Any more invasive changes should get more rigid testing first. It's moreover only very few machines with the problem and a DMI based hack seems to fit that situation. An early boot parameter to make the choice manually (and override any possible DMI based decision) is also provided: io_delay=standard|alternate This does not change the io_delay() in the boot code which is using the same port 0x80 I/O delay but those do not appear to be a problem as tested by David P. Reed. He moreover reported that booting with "acpi=off" also fixed things and seeing as how ACPI isn't touched until after this DMI based I/O port switch leaving the ones in the boot code be is safe. This patch is partly based on earlier patches from Pavel Machek and David P. Reed. Signed-off-by: Rene Herman diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index 33121d6..6948e25 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -785,6 +785,12 @@ and is between 256 and 4096 characters. It is defined in the file for translation below 32 bit and if not available then look in the higher range. + io_delay= [X86-32,X86-64] I/O delay port + standard + Use the 0x80 standard I/O delay port (default) + alternate + Use the 0xed alternate I/O delay port + io7= [HW] IO7 for Marvel based alpha systems See comment before marvel_specify_io7 in arch/alpha/kernel/core_marvel.c. diff --git a/arch/x86/boot/compressed/misc_32.c b/arch/x86/boot/compressed/misc_32.c index b74d60d..288e162 100644 --- a/arch/x86/boot/compressed/misc_32.c +++ b/arch/x86/boot/compressed/misc_32.c @@ -276,10 +276,10 @@ static void putstr(const char *s) RM_SCREEN_INFO.orig_y = y; pos = (x + cols * y) * 2; /* Update cursor position */ - outb_p(14, vidport); - outb_p(0xff & (pos >> 9), vidport+1); - outb_p(15, vidport); - outb_p(0xff & (pos >> 1), vidport+1); + outb(14, vidport); + outb(0xff & (pos >> 9), vidport+1); + outb(15, vidport); + outb(0xff & (pos >> 1), vidport+1); } static void* memset(void* s, int c, unsigned n) diff --git a/arch/x86/boot/compressed/misc_64.c b/arch/x86/boot/compressed/misc_64.c index 6ea015a..43e5fcc 100644 --- a/arch/x86/boot/compressed/misc_64.c +++ b/arch/x86/boot/compressed/misc_64.c @@ -269,10 +269,10 @@ static void putstr(const char *s) RM_SCREEN_INFO.orig_y = y; pos = (x + cols * y) * 2; /* Update cursor position */ - outb_p(14, vidport); - outb_p(0xff & (pos >> 9), vidport+1); - outb_p(15, vidport); - outb_p(0xff & (pos >> 1), vidport+1); + outb(14, vidport); + outb(0xff & (pos >> 9), vidport+1); + outb(15, vidport); + outb(0xff & (pos >> 1), vidport+1); } static void* memset(void* s, int c, unsigned n) diff --git a/arch/x86/kernel/Makefile_32 b/arch/x86/kernel/Makefile_32 index a7bc93c..0cc1981 100644 --- a/arch/x86/kernel/Makefile_32 +++ b/arch/x86/kernel/Makefile_32 @@ -8,7 +8,7 @@ CPPFLAGS_vmlinux.lds += -Ui386 obj-y := process_32.o signal_32.o entry_32.o traps_32.o irq_32.o \ ptrace_32.o time_32.o ioport_32.o ldt_32.o setup_32.o i8259_32.o sys_i386_32.o \ pci-dma_32.o i386_ksyms_32.o i387_32.o bootflag.o e820_32.o\ - quirks.o i8237.o topology.o alternative.o i8253.o tsc_32.o + quirks.o i8237.o topology.o alternative.o i8253.o tsc_32.o io_delay.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += cpu/ diff --git a/arch/x86/kernel/Makefile_64 b/arch/x86/kernel/Makefile_64 index 5a88890..08a68f0 100644 --- a/arch/x86/kernel/Makefile_64 +++ b/arch/x86/kernel/Makefile_64 @@ -11,7 +11,7 @@ obj-y := process_64.o signal_64.o entry_64.o traps_64.o irq_64.o \ x8664_ksyms_64.o i387_64.o syscall_64.o vsyscall_64.o \ setup64.o bootflag.o e820_64.o reboot_64.o quirks.o i8237.o \ pci-dma_64.o pci-nommu_64.o alternative.o hpet.o tsc_64.o bugs_64.o \ - i8253.o + i8253.o io_delay.o obj-$(CONFIG_STACKTRACE) += stacktrace.o obj-y += cpu/ diff --git a/arch/x86/kernel/io_delay.c b/arch/x86/kernel/io_delay.c new file mode 100644 index 0000000..77a8bcd --- /dev/null +++ b/arch/x86/kernel/io_delay.c @@ -0,0 +1,77 @@ +/* + * I/O delay strategies for inb_p/outb_p + */ + +#include +#include +#include +#include +#include + +/* + * Allow for a DMI based override of port 0x80 + */ +#define IO_DELAY_PORT_STD 0x80 +#define IO_DELAY_PORT_ALT 0xed + +static unsigned short io_delay_port __read_mostly = IO_DELAY_PORT_STD; + +void native_io_delay(void) +{ + asm volatile ("outb %%al, %w0" : : "d" (io_delay_port)); +} +EXPORT_SYMBOL(native_io_delay); + +static int __init dmi_io_delay_port_alt(const struct dmi_system_id *id) +{ + printk(KERN_NOTICE "%s: using alternate I/O delay port\n", id->ident); + io_delay_port = IO_DELAY_PORT_ALT; + return 0; +} + +static struct dmi_system_id __initdata dmi_io_delay_port_alt_table[] = { + { + .callback = dmi_io_delay_port_alt, + .ident = "Compaq Presario V6000", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"), + DMI_MATCH(DMI_BOARD_NAME, "30B7") + } + }, + { + .callback = dmi_io_delay_port_alt, + .ident = "HP Pavilion dv9000z", + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "Quanta"), + DMI_MATCH(DMI_BOARD_NAME, "30B9") + } + }, + { + } +}; + +static int __initdata io_delay_override; + +static int __init io_delay_param(char *s) +{ + if (!s) + return -EINVAL; + + if (!strcmp(s, "standard")) + io_delay_port = IO_DELAY_PORT_STD; + else if (!strcmp(s, "alternate")) + io_delay_port = IO_DELAY_PORT_ALT; + else + return -EINVAL; + + io_delay_override = 1; + return 0; +} + +early_param("io_delay", io_delay_param); + +void __init io_delay_init(void) +{ + if (!io_delay_override) + dmi_check_system(dmi_io_delay_port_alt_table); +} diff --git a/arch/x86/kernel/setup_32.c b/arch/x86/kernel/setup_32.c index e1e18c3..6c3a3b4 100644 --- a/arch/x86/kernel/setup_32.c +++ b/arch/x86/kernel/setup_32.c @@ -648,6 +648,8 @@ void __init setup_arch(char **cmdline_p) dmi_scan_machine(); + io_delay_init();; + #ifdef CONFIG_X86_GENERICARCH generic_apic_probe(); #endif diff --git a/arch/x86/kernel/setup_64.c b/arch/x86/kernel/setup_64.c index 30d94d1..ec976ed 100644 --- a/arch/x86/kernel/setup_64.c +++ b/arch/x86/kernel/setup_64.c @@ -311,6 +311,8 @@ void __init setup_arch(char **cmdline_p) dmi_scan_machine(); + io_delay_init(); + #ifdef CONFIG_SMP /* setup to use the static apicid table during kernel startup */ x86_cpu_to_apicid_ptr = (void *)&x86_cpu_to_apicid_init; diff --git a/include/asm-x86/io_32.h b/include/asm-x86/io_32.h index fe881cd..690b8f4 100644 --- a/include/asm-x86/io_32.h +++ b/include/asm-x86/io_32.h @@ -250,10 +250,8 @@ static inline void flush_write_buffers(void) #endif /* __KERNEL__ */ -static inline void native_io_delay(void) -{ - asm volatile("outb %%al,$0x80" : : : "memory"); -} +extern void io_delay_init(void); +extern void native_io_delay(void); #if defined(CONFIG_PARAVIRT) #include diff --git a/include/asm-x86/io_64.h b/include/asm-x86/io_64.h index a037b07..b2d4994 100644 --- a/include/asm-x86/io_64.h +++ b/include/asm-x86/io_64.h @@ -35,13 +35,18 @@ * - Arnaldo Carvalho de Melo */ -#define __SLOW_DOWN_IO "\noutb %%al,$0x80" +extern void io_delay_init(void); +extern void native_io_delay(void); +static inline void slow_down_io(void) +{ + native_io_delay(); #ifdef REALLY_SLOW_IO -#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO __SLOW_DOWN_IO -#else -#define __FULL_SLOW_DOWN_IO __SLOW_DOWN_IO + native_io_delay(); + native_io_delay(); + native_io_delay(); #endif +} /* * Talk about misusing macros.. @@ -50,21 +55,21 @@ static inline void out##s(unsigned x value, unsigned short port) { #define __OUT2(s,s1,s2) \ -__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1" +__asm__ __volatile__ ("out" #s " %" s1 "0,%" s2 "1" : : "a" (value), "Nd" (port)) #define __OUT(s,s1,x) \ -__OUT1(s,x) __OUT2(s,s1,"w") : : "a" (value), "Nd" (port)); } \ -__OUT1(s##_p,x) __OUT2(s,s1,"w") __FULL_SLOW_DOWN_IO : : "a" (value), "Nd" (port));} \ +__OUT1(s,x) __OUT2(s,s1,"w"); } \ +__OUT1(s##_p,x) __OUT2(s,s1,"w"); slow_down_io(); } #define __IN1(s) \ static inline RETURN_TYPE in##s(unsigned short port) { RETURN_TYPE _v; #define __IN2(s,s1,s2) \ -__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0" +__asm__ __volatile__ ("in" #s " %" s2 "1,%" s1 "0" : "=a" (_v) : "Nd" (port)) -#define __IN(s,s1,i...) \ -__IN1(s) __IN2(s,s1,"w") : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \ -__IN1(s##_p) __IN2(s,s1,"w") __FULL_SLOW_DOWN_IO : "=a" (_v) : "Nd" (port) ,##i ); return _v; } \ +#define __IN(s,s1) \ +__IN1(s) __IN2(s,s1,"w"); return _v; } \ +__IN1(s##_p) __IN2(s,s1,"w"); slow_down_io(); return _v; } #define __INS(s) \ static inline void ins##s(unsigned short port, void * addr, unsigned long count) \ --------------090605060307080505000205-- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/